Classical-driving-assisted quantum speed-up

Classical-driving-assisted quantum speed-up
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经典驱动辅助量子加速

DOI:
10.1103/physreva.91.032112
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发表时间:
2014-10
期刊:
影响因子:
2.9
通讯作者:
Fan, Heng
Fan, Heng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Han, Wei;Xia, Yun-Jie;Cao, Jun-Peng;Fan, Heng

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我们提出了一种通过外加经典驱动场来加速零温结构库中量子比特的演化速度的方法。研究表明,只要合理选择经典场的驱动强度,无论是在弱系统与环境耦合的情况下,还是在强系统与环境耦合的情况下,开放系统都可以实现加速进化。通过考虑环境的非马尔可夫性与经典场之间的关系,我们可以通过控制经典场的驱动强度来驱动开放系统从马尔可夫状态到非马尔可夫状态。这是经典场引起加速过程的内在物理原因。此外,还讨论了在整个退相干过程中该经典场对量子演化速度变化的影响。
We propose a method of accelerating the speed of evolution of an open system by an external classical driving field for a qubit in a zero-temperature structured reservoir. It is shown that, with a judicious choice of the driving strength of the applied classical field, a speed-up evolution of an open system can be achieved in both the weak system-environment couplings and the strong system-environment couplings. By considering the relationship between non-Makovianity of environment and the classical field, we can drive the open system from the Markovian to the non-Markovian regime by manipulating the driving strength of classical field. That is the intrinsic physical reason that the classical field may induce the speed-up process. In addition, the roles of this classical field on the variation of quantum evolution speed in the whole decoherence process is discussed.
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